Effect of Dopants and Solvents on Chronoamperometry of Polypyrrole
PPy was galvanostatically formed on a platium plate in the system of TBADS-AN or NaDS-H2O. DS¯ embedded in the polymer on polymerization leaves on reducing in AN but sticks to it in H2O. The aliphatic portion of the dopant contracts to become immobile in H2O. Na+ moves into polymer on reducing to counter the electrically freed anion. Diffusion coefficient of Na+ deduced by chronoamperometry is 5.2X10−10 cm2/sec in H2O while that of TBA+ is 2xl0−11 cm2/sec in H2O. The coefficient of DS¯ of the polymer formed with NaDS is 3.6x10−10 cm2/sec in AN and that of the polymer formed with TBADS 4.7xl0−10 cm2/sec.
KeywordsPlatinum Acetonitrile Pyrrole Exter Polypyrrole
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